Datasheet LT3744 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | High Current Synchronous Step-Down LED Driver |
| Páginas / Página | 32 / 9 — Typical perForMance characTerisTics. OVLO Threshold. PWM1, PWM2, PWM3 … |
| Formato / tamaño de archivo | PDF / 782 Kb |
| Idioma del documento | Inglés |
Typical perForMance characTerisTics. OVLO Threshold. PWM1, PWM2, PWM3 Threshold. SYNC Threshold. PWM Driver RDS(ON)
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LT3744
Typical perForMance characTerisTics OVLO Threshold PWM1, PWM2, PWM3 Threshold SYNC Threshold
1.56 1.6 1.6 1.54 1.5 1.5 RISING THRESHOLD RISING THRESHOLD 1.52 1.4 1.4 1.5 RISING THRESHOLD TAGE (V) 1.3 1.3 FALLING THRESHOLD TAGE (V) FALLING THRESHOLD (V) 1.48 1.2 1.2 V FB FALLING THRESHOLD PIN VOL 1.46 1.1 PIN VOL 1.1 1.44 V PWMx 1 V SYNC 1 1.42 0.9 0.9 1.4 0.8 0.8 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3744 G27 3744 G28 3744 G29
PWM Driver RDS(ON) Bottom Gate Driver RDS(ON) Top Gate Driver RDS(ON)
7 2.5 3.5 PMOSRDS(ON) PMOSRDS(ON) PMOSRDS(ON) 6 3.0 2 5 2.5 1.5 (Ω) 4 (Ω) (Ω) 2.0 NMOSR 3 DS(ON) 1.5 R DS(ON) NMOSRDS(ON) R DS(ON) 1.0 R DS(ON) NMOSRDS(ON) 2 1.0 0.5 1 0.5 0 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3744 G30 3744 G31 3744 G32
Non-Overlap PWM Signal Delay BG and TG Non-Overlap Time TG Minimum On-Time
230 60 300 220 55 250 210 50 200 200 45 HG TO LG DELAY MINIMUM ON-TIME Y (nsec) 190 40 150 LG TO HG DELAY DELA 180 35 100 170 MINIMUM OFF-TIME NON-OVERLAP TIME (nsec) 30 50 160 25 MINIMUM ON AND OFF TIME (nsec) 150 20 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3744 G33 3744 G34 3744 G35 3744fa For more information www.linear.com/LT3744 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
Typical perForMance characTerisTics OVLO Threshold PWM1, PWM2, PWM3 Threshold SYNC Threshold
1.56 1.6 1.6 1.54 1.5 1.5 RISING THRESHOLD RISING THRESHOLD 1.52 1.4 1.4 1.5 RISING THRESHOLD TAGE (V) 1.3 1.3 FALLING THRESHOLD TAGE (V) FALLING THRESHOLD (V) 1.48 1.2 1.2 V FB FALLING THRESHOLD PIN VOL 1.46 1.1 PIN VOL 1.1 1.44 V PWMx 1 V SYNC 1 1.42 0.9 0.9 1.4 0.8 0.8 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3744 G27 3744 G28 3744 G29
PWM Driver RDS(ON) Bottom Gate Driver RDS(ON) Top Gate Driver RDS(ON)
7 2.5 3.5 PMOSRDS(ON) PMOSRDS(ON) PMOSRDS(ON) 6 3.0 2 5 2.5 1.5 (Ω) 4 (Ω) (Ω) 2.0 NMOSR 3 DS(ON) 1.5 R DS(ON) NMOSRDS(ON) R DS(ON) 1.0 R DS(ON) NMOSRDS(ON) 2 1.0 0.5 1 0.5 0 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3744 G30 3744 G31 3744 G32
Non-Overlap PWM Signal Delay BG and TG Non-Overlap Time TG Minimum On-Time
230 60 300 220 55 250 210 50 200 200 45 HG TO LG DELAY MINIMUM ON-TIME Y (nsec) 190 40 150 LG TO HG DELAY DELA 180 35 100 170 MINIMUM OFF-TIME NON-OVERLAP TIME (nsec) 30 50 160 25 MINIMUM ON AND OFF TIME (nsec) 150 20 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3744 G33 3744 G34 3744 G35 3744fa For more information www.linear.com/LT3744 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts